Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Mar. 28, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 313,050	$ 307,990
Gross Unrealized Gains	7,151	1,584
Gross Unrealized Losses	(72)	(3,993)
Estimated Fair Value (Net Carrying Amount)	320,129	305,581
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	294,015	286,668
Gross Unrealized Gains	6,727	1,157
Gross Unrealized Losses	(72)	(3,993)
Estimated Fair Value (Net Carrying Amount)	300,670	283,832
Non-U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,879	12,483
Gross Unrealized Gains	316	260
Gross Unrealized Losses	0	0
Estimated Fair Value (Net Carrying Amount)	13,195	12,743
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,267	8,839
Gross Unrealized Gains	108	167
Gross Unrealized Losses	0	0
Estimated Fair Value (Net Carrying Amount)	5,375	$ 9,006
Agency discount notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	889
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value (Net Carrying Amount)	$ 889

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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